Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 8 x + 174 x^{2} + 664 x^{3} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.520480950026$, $\pm0.622274417693$ |
| Angle rank: | $2$ (numerical) |
| Number field: | 4.0.1509632.2 |
| Galois group: | $D_{4}$ |
| Jacobians: | $154$ |
| Isomorphism classes: | 242 |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.
Newton polygon
This isogeny class is ordinary.
| $p$-rank: | $2$ |
| Slopes: | $[0, 0, 1, 1]$ |
Point counts
Point counts of the abelian variety
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $7736$ | $49448512$ | $325985888312$ | $2251637598331904$ | $15516662024081894776$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $92$ | $7174$ | $570116$ | $47444526$ | $3939198252$ | $326940666742$ | $27136041897812$ | $2252292244215774$ | $186940255472342012$ | $15516041187482015334$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 154 curves (of which all are hyperelliptic):
- $y^2=52 x^6+4 x^5+24 x^4+60 x^3+30 x^2+52 x+60$
- $y^2=10 x^6+78 x^5+78 x^3+82 x^2+16 x+80$
- $y^2=48 x^6+40 x^5+70 x^4+4 x^3+16 x^2+7 x+40$
- $y^2=37 x^6+13 x^5+33 x^4+66 x^3+67 x^2+71 x+13$
- $y^2=28 x^6+74 x^5+47 x^4+66 x^3+52 x^2+20 x+18$
- $y^2=19 x^6+34 x^5+6 x^4+24 x^3+21 x^2+80 x+9$
- $y^2=50 x^6+50 x^5+11 x^4+29 x^3+21 x^2+25 x+28$
- $y^2=75 x^6+32 x^5+61 x^4+39 x^3+56 x^2+72 x+80$
- $y^2=16 x^6+42 x^5+58 x^4+54 x^3+58 x^2+14 x+14$
- $y^2=4 x^6+6 x^5+19 x^4+32 x^3+14 x^2+16 x+75$
- $y^2=74 x^6+48 x^5+3 x^4+79 x^3+63 x^2+68 x+75$
- $y^2=4 x^6+5 x^5+26 x^4+55 x^3+18 x^2+28$
- $y^2=52 x^6+17 x^5+51 x^4+42 x^3+12 x^2+27 x+44$
- $y^2=17 x^6+20 x^5+24 x^4+76 x^3+69 x^2+53 x+30$
- $y^2=81 x^6+36 x^5+8 x^4+4 x^3+56 x^2+55 x+75$
- $y^2=34 x^6+49 x^5+69 x^4+x^3+81 x^2+2 x+12$
- $y^2=21 x^6+55 x^5+31 x^4+56 x^3+17 x^2+2 x+17$
- $y^2=26 x^6+7 x^5+32 x^4+24 x^3+29 x^2+56 x+39$
- $y^2=22 x^6+8 x^5+42 x^4+71 x^3+38 x^2+13 x+9$
- $y^2=73 x^6+46 x^5+27 x^4+57 x^3+32 x^2+25 x+5$
- and 134 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{83}$.
Endomorphism algebra over $\F_{83}$| The endomorphism algebra of this simple isogeny class is 4.0.1509632.2. |
Base change
This is a primitive isogeny class.
Twists
Below is a list of all twists of this isogeny class.
| Twist | Extension degree | Common base change |
|---|---|---|
| 2.83.ai_gs | $2$ | (not in LMFDB) |